South Korean soldiers work on their K-9 self-propelled artillery vehicles during an exercise against possible attacks by North Korea near the border village of Panmunjom in Paju, South Korea, Thursday, March 7, 2013. North Korea vowed Tuesday to cancel the 1953 cease-fire that ended the Korean War, citing a U.S.-led push for U.N. sanction over its recent nuclear test and ongoing U.S.-South Korean joint military exercise.  (AP Photo/Ahn Young-joon)
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